The plant and all facilities of utilities must be constructed and installed in conformity with good engineering practice and comply with the minimum standards as set out in the National Electric Safety Code. Information about this standard regarding the version adopted and where to obtain it is set forth in WAC 480-120-999 (Adoption by reference). All instrumentalities and equipment must be installed and maintained with due consideration to the safety of the customers, employees and general public. Hazardous conditions endangering persons, property, or the continuity of service when found, reported or known to exist, must be expeditiously corrected.